Question

during periods when the thermohaline circulation slowed down temperatures in the northern hemisphere _____, while during periods when the thermohaline circulation sped up temperatures in the northern hemisphere _____.

○ increased, decreased

○ decreased, increased

○ were constant, increased

○ decreased, were constant

○ increased, were constant

Explanation:

The thermohaline circulation (part of ocean currents) transports warm water to the Northern Hemisphere. If it slows down, less warm water is transported, so temperatures decrease. If it speeds up, more warm water is transported, so temperatures increase. So the correct pair is decreased (when slowed) and increased (when sped up).

Answer:

B. decreased, increased